Global Environmental Multiscale Model (GEM)

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The model is global so that the long waves are handled properly for both data assimilation and extended-range forecasting. The model has a variable-resolution capability such that it is possible to use either a uniform-resolution latitude/longitude mesh, or a variable-resolution one that uses a rotated-coordinate system with a
high-resolution sub-domain that can be located over any portion of the globe. Outside this area, the grid
spacing smoothly increases to reach its maximum value at the antipodes. Data set resolution is .24 x .24 degrees, which corresponds to about 25 km resolution.